Along with Tara Agacayak, I run a private mastermind group on LinkedIn (it’s a subgroup of my Creative Entrepreneurs & Social Media group).
Here are my thoughts from one of those sessions, on the topic of a grant-writing consulting biz:
If you were to create a blog to sell this skill I imagine you sharing resources, techniques, news about the grant writing process and opportunities. Examples and lessons drawn from your own experiences consulting others. Taking questions from your readers and addressing the answers in a post, all the while very clearly offering your consulting services -- more of the same high value understanding of the field, and personalized attention for the client -- at the end of each post, in the side bar. Offering a teleclass on the basics of grant writing. selling small ebooks with up-to-date resources and your guidance on various elements of grantwriting, and considerations for different sectors.
I bet you could knock out 20 topics you'd want to cover in a blog series, and that would get you very well started. try making a list of catchy headlines to peg the subject matter... "Grants, in this economy?!" "The secret of getting a grant" etc.
I'm not familiar with the territory but you might like to distinguish yourself from the other grant writing consultants out there -- so a bit of research to see what they're doing and how you might like to approach it differently. what you know/care about that they don't. personally, i'd love to see you bring a little of your personality to this business -- if it's at all possible. Who needs dry info when they can get a little zing with solid advice? It could be simply in the language you use to talk to your readers about what might be a dry subject.
I would love to learn more about grants *I* could get! Bet we all would. You could be the cool educator of your audience. How about targeting the audience you already have -- and help them find grants to do the work they love -- rather than splitting off to service a different group of people?